Exactly what do you mean by a blocked site?
Who is blocking them?
If they are blocked by a local firewall on your companie's intenret connection you can allow access if you have control of the firewall or if they honor a request to unblock your PC's connecton.
Some countries block sites like china for example - you may be able to get around such blocking by finding a PROXY site that is not blocked to you.

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There are several reason for this site to be blocked:1. check you firewall and make sure that this site is not excluded in you firewall list.2. Check with your Internet Service Provider (ISP) and ask them if this site has been blocked.3. the best solution is to hide your IP address by using programs like HideYourIP or similar and check this site again.

Try to check your browser settings. Delete browser cache and temporary files (by going to Tools-> Internet options-> delete). Also check the settings on your router if there are any blocked sites. Best way is to type the name of the site only is the address bar (like "google" or "yahoo") and click CLT+ENTER together. It will open the page automatically.

**If this works please rate else let me know in case of further help.**

Initially what you can do is to try to allow orkut website and include this in the list of your Trusted websites. Click Tools, Internet Options. Click Trusted Sites and include Orkut. However, if your IT department has a Router, and they blocked it from
there, then there is really nothing you can do but to ask them unblock
it.

Please check that your firewall is blocking the messenger. If you donot have fire wall installed then its a virus or Spy ware is blocking else the messenger is corrupted. First check firewall settings.